ENERGY MANAGEMENT WITH THE
FRONIUS WATTPILOT
APPLICATION GUIDE
Cellular Solution Whitepaper
Energy management with the Fronius Wattpilot
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© Fronius International GmbH
Version 1 February/2022 Click here to enter text
Solar Energy / Partner Programs and Trainings
Fronius reserves all rights, in particular the right of reproduction and distribution as well as translation. No part of this work may be
reproduced in any form or stored, processed, duplicated or distributed using electrical systems without the written permission of Fronius.
It should be noted that, despite careful editing, all information in this document is provided without guarantee and any liability on the part
of the author or Fronius is excluded. Gender-specific formulations refer equally to the female and male form.
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Table of contents
1
INTRODUCTION ..............................................................................................................................4
1.1 Validity ............................................................................................................................................................. 4
2 Sector coupling ...............................................................................................................................4
3 Prioritization of the components ...................................................................................................5
3.1 The customer has a stationary battery and a Wattpilot .................................................................................... 6
3.1.1. Use case 1: The battery has the highest priority .................................................................................6
3.1.2. Use case 2: The Wattpilot has top priority ...........................................................................................7
3.2 The customer has a stationary battery, a Wattpilot and an Ohmpilot ............................................................... 8
3.2.1. Use case 1: The battery has the highest priority .................................................................................8
3.2.2. Use case 2: The Wattpilot has top priority ...........................................................................................9
3.2.3. Use case 3: The Ohmpilot has the highest priority ........................................................................... 10
3.3 The customer has a Wattpilot and an Ohmpilot ............................................................................................. 11
3.3.1. Use case 1: The Wattpilot has the highest priority ........................................................................... 11
3.3.2. Use case 2: The Ohmpilot has top priority ....................................................................................... 12
3.4 Special case load management with the 4 digital I/Os ................................................................................... 13
4 Settings on the Fronius inverter ................................................................................................ 14
4.1 Access to the web interface ........................................................................................................................... 14
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1 INTRODUCTION
This document provides an overview of the possible uses of the Fronius Wattpilot in conjunction with Fronius
inverters. On the one hand, an overview of the possibilities of energy management in connection with the
photovoltaic system is given, and on the other hand, the advantages of sector coupling with a focus on the
mobility sector are shown.
In the following, Fronius presents the possibilities of integrating the Fronius Wattpilot into the overall solar
system and shows the possibilities of holistic energy management on the way to 24 hours of sun.
1.1 Validity
This white paper covers the following inverter types:
/ Fronius GEN24 Plus
/ Fronius Tauro
/ SnapINverter generation (web server)
/ Fronius Symo Hybrid
/ and the Datamanager Box
2 Sector coupling
Electromobility is a central point of the energy transition, with the help of which current climate protection goals
can be achieved. By integrating electrically powered vehicles, it is also possible to store the uneven generation
from renewable energies, thereby enabling a constant power draw from the photovoltaic system. This can
increase self-consumption and minimize feed-in to the public grid. The proliferation of electrically powered
vehicles, in addition to the obvious benefits such as better air quality in cities, lower noise pollution or lower
energy consumption, also results in other advantages related to the electromobility system. One of these
additional benefits is the fact that any vehicle on the road can also be used as a mobile electricity storage unit
for renewable energy generation. In order to make the best possible use of this generation and relieve the
strain on public grids, sector coupling is a key element. As a solution provider, Fronius offers the possibility of
implementing sector coupling in one's own household. All 3 sectors are included for this purpose:
/ Electricity (Fronius hybrid inverter and stationary battery storage)
/ Heat (Fronius Ohmpilot for hot water generation or heating)
/ Mobility (Fronius Wattpilot for charging the electric vehicle).
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3 Prioritization of the components
To give the customer the greatest possible individualization, Fronius energy management offers the option of
prioritizing the individual system components among themselves. This allows the customer to decide for
himself what the available energy from the PV system should be used for. This chapter deals with the following
3 components that can be prioritized in energy management:
/ Stationary battery storage
/ Fronius Ohmpilot
/ Fronius Wattpilot
For the configuration of the prioritization, two threshold values are available in the Solar.wattpilot app, which
can be set as desired. This defines the behavior of the overall system.
PV battery threshold
If a battery is installed in the PV system, a threshold value (in % of SOC) can be set here. During operation,
the SOC (State of charge) of the battery is constantly checked. If the current SOC is below the set value, the
battery is preferably charged. As soon as the current SOC of the battery rises above the set threshold, from
then on the energy is used to charge the car. The SOC of the stationary battery can nevertheless continue to
rise slowly, since the car is regulated in whole ampere steps and any excess energy is stored in the stationary
battery.
Ohmpilot threshold
If a Fronius Ohmpilot is installed in the PV system, a threshold value for the desired setpoint temperature (in
°C) can be set here. During operation, the current temperature is constantly measured. If the current
temperature is below the set threshold value, preference is given to using the temperature set for the
available energy is heated. If the temperature exceeds the set value, the available energy is used to charge
the car. The temperature can still continue to rise slowly as the car is charged in whole ampere steps and any
excess energy is used for the Ohmpilot. To use the function with an available Fronius Ohmpilot, a
temperature sensor must be connected to the Ohmpilot.
In the following, the possible settings will be described on the basis of use cases.
For more detailed information on how to access the web interface of the inverter, please read the chapter
Access to the web interface.
IMPORTANT: For correct prioritization, the settings must be made in the Solar.wattpilot app under
"Settings
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""Cost optimization" and additionally in the web interface of the Fronius inverter.
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